<div dir="ltr"><div dir="ltr"></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 10 Oct 2019 at 15:50, Vɑdɪm <<a href="mailto:vadp.devl@gmail.com">vadp.devl@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Florian Lohoff-2 wrote<br>
> On Thu, Oct 10, 2019 at 08:38:28AM +0200, Frederik Ramm wrote:<br>
> Mapping large, multi-lane roads with a "do not cross line" in the<br>
> middle as single line requires 4-5 times the number of turn<br>
> restrictions. These are number i am estimating from my own experience<br>
> mapping it one or the other way.<br>
> At every way junction one has to model every disallowed way/turn.<br>
> From my experience this is very error prone.<br>
<br>
+1 <br>
<br>
Also there are some arrangements which probably do not have a simple<br>
solution even with centre=* tag suggested here.<br>
<br>
For example a street with a tramway track in the middle separated from the<br>
rest of the roadbed by dividing lines at each side which vehicles cannot<br>
cross: <a href="https://goo.gl/maps/VHKbwjMoCVwawHxU9" rel="noreferrer" target="_blank">https://goo.gl/maps/VHKbwjMoCVwawHxU9</a>. By the way tramway tracks are<br>
drawn with two separate ways, so a single way line in the middle would make<br>
you think that the tramway tracks are not in the middle of the roadbed but<br>
at its sides.<br>
<br>
Another example is a bus lane in the middle of the road: 2 lanes of forward<br>
traffic, a forward bus lane, a backward bus lane, backward traffic<br>
<a href="https://goo.gl/maps/FubkLdHRP6DHLkv86" rel="noreferrer" target="_blank">https://goo.gl/maps/FubkLdHRP6DHLkv86</a>.<br>
<br>
Yes another one is a bus lane on the right side, but it turns on the left<br>
through 4 lanes of normal forward traffic which not allowed to turn left<br>
<a href="https://goo.gl/maps/QFcfDW9h7cQ3UMJaA" rel="noreferrer" target="_blank">https://goo.gl/maps/QFcfDW9h7cQ3UMJaA</a>.<br>
<br></blockquote><div>
<div>I think for some of the more complex streets some grouping concept is needed whether via areas or relations. The latter is probably a bit fragile, the former is at least somewhat consistent with man_made=bridge and previous 'junction area' proposals. <br></div><div><br></div><div>There was a talk along these lines at SOTM recently, although I'm not so keen on the areas overlapping:</div><div><a href="https://media.ccc.de/v/sotm2019-1038-is-the-osm-data-model-creaking-#t=1263">https://media.ccc.de/v/sotm2019-1038-is-the-osm-data-model-creaking-#t=1263</a></div><br></div><div>For the primary way mapping I don't think we should be splitting ways according to direction unless there is a barrier or median. <br></div></div></div>